LG 1480FHD washing machine has a small leak how can I fix it?

My LG 1480FHD washing machine has a small leak when in use, the leak is located underneath the small door hatch that contains the filter, I have removed the filter and cleaned it but it still leaks. I noticed when I took the cover off the filter hatch that there are two outlets (or bung holes) one had a cover but the other did not, is there something missing from this other (outlet) which is maybe causing the leak?